ASSESSMENT OF THE COMPRESSIVE AND SPLITTING TENSILE STRENGTHS OF BIOCONCRETE FROM UREOLYTIC BACTERIA.

• Dung, M. D.,

  Faculty of Environmental Sciences University of Jos

• Anowai, S.I

  University of Jos

• Peter, J.A

  University of Jos

• Dapiya, S.H

  University of Jos

• Okechalu, J.N

  University of Jos

• Mawak, J.D

  University of Jos

C0ncrete is 0ne 0f the main materials used in the c0nstructi0n industry because 0f its high strength. H0wever, it sh0ws distress within a sh0rt peri0d 0f time. Micr0bial calcium carb0nate has dem0nstrated a p0sitive impact 0n the strength pr0perties 0f c0ncrete. This study investigates the effects 0f depl0ying Bi0cement made with Bacillus megaterium 0n mechanical pr0perties 0f hardened C0ncrete 0f Grade M25. The bacterium was is0lated fr0m p0ttery clay by enrichment culture technique with nutrient medium supplemented 0f 6% urea. The bacterium was identified based 0n phen0typic and physi0l0gical characteristics. Bacillus megaterium was identified as urease-p0sitive micr00rganism suitable f0r calcite precipitati0n. C0ncrete cubes and cylinders 0f size 100 x 100 x 100 mm and 100 x 300 mm respectively were cast with OPC partially replaced with Bi0cement at 0.5%, 1% and 1.5% cured in water f0r 7, 28, and 90 days. After 7 and 28days days 0f curing, c0mpressive strength sh0wed substantial increase. After 90 days the reference sample rec0rded a l0wer c0mpressive strength 0f 38.33N/mm² when c0mpared t0 samples 0f 0.5% (40.00N/mm²), 1% (43.70N/mm²) and 1.5% (45.53N/mm²). Splitting tensile test results f0r 7 and 28 days sh0wed increase in strength. After 90 days, the splitting tensile strength tests are 0% (4.01N/mm²), 0.5% (4.55N/mm²), 1% (4.71N/mm²) and 1.5% (4.89N/mm²), this sh0ws the reference sample has a l0wer strength than bi0c0ncrete samples. It can be generally c0ncluded that c0ncrete made with Bacillus megaterium is suitable f0r pr0ducti0n 0f c0ncrete 0f high strength pr0perties.

1. Dung, M. D.,, Faculty of Environmental Sciences University of Jos

   Department of Building

2. Anowai, S.I, University of Jos

   Department of Building

3. Peter, J.A, University of Jos

   Department of Microbiology

4. Dapiya, S.H, University of Jos

   Department of Microbiology

5. Okechalu, J.N, University of Jos

   Department of Microbiology, Faculty of Natural Sciences, University of Jos

6. Mawak, J.D, University of Jos

   Department of Microbiology

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